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這篇文章將為大家詳細講解有關怎么在Spring中遠程調用HttpClient和RestTemplate，文章內容質量較高，因此小編分享給大家做個參考，希望大家閱讀完這篇文章后對相關知識有一定的了解。
導入坐標
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.4</version> </dependency>
//1、使用HttpClient發起Get請求
public class DoGET {
public static void main(String[] args) throws Exception {
// 創建Httpclient對象,相當于打開了瀏覽器
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建HttpGet請求，相當于在瀏覽器輸入地址
HttpGet httpGet = new HttpGet("http://www.baidu.com/");
CloseableHttpResponse response = null;
try {
// 執行請求，相當于敲完地址后按下回車。獲取響應
response = httpclient.execute(httpGet);
// 判斷返回狀態是否為200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析響應，獲取數據
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
// 關閉資源
response.close();
}
// 關閉瀏覽器
httpclient.close();
}
}
}
//2、使用HttpClient發起帶參數的Get請求
public class DoGETParam {
public static void main(String[] args) throws Exception {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建URI對象，并且設置請求參數
URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build();
// 創建http GET請求
HttpGet httpGet = new HttpGet(uri);
// HttpGet get = new HttpGet("http://www.baidu.com/s?wd=java");
CloseableHttpResponse response = null;
try {
// 執行請求
response = httpclient.execute(httpGet);
// 判斷返回狀態是否為200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析響應數據
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
httpclient.close();
}
}
}
//3、使用HttpClient發起POST請求
public class DoPOST {
public static void main(String[] args) throws Exception {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http POST請求
HttpPost httpPost = new HttpPost("http://www.oschina.net/");
// 把自己偽裝成瀏覽器。否則開源中國會攔截訪問
httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
CloseableHttpResponse response = null;
try {
// 執行請求
response = httpclient.execute(httpPost);
// 判斷返回狀態是否為200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析響應數據
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
// 關閉瀏覽器
httpclient.close();
}
}
}
//4、使用HttpClient發起帶有參數的POST請求
public class DoPOSTParam {
public static void main(String[] args) throws Exception {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http POST請求，訪問開源中國
HttpPost httpPost = new HttpPost("http://www.oschina.net/search");
// 根據開源中國的請求需要，設置post請求參數
List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
parameters.add(new BasicNameValuePair("scope", "project"));
parameters.add(new BasicNameValuePair("q", "java"));
parameters.add(new BasicNameValuePair("fromerr", "8bDnUWwC"));
// 構造一個form表單式的實體
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
// 將請求實體設置到httpPost對象中
httpPost.setEntity(formEntity);
CloseableHttpResponse response = null;
try {
// 執行請求
response = httpclient.execute(httpPost);
// 判斷返回狀態是否為200
if (response.getStatusLine().getStatusCode() == 200) {
// 解析響應體
String content = EntityUtils.toString(response.getEntity(), "UTF-8");
System.out.println(content);
}
} finally {
if (response != null) {
response.close();
}
// 關閉瀏覽器
httpclient.close();
}
}
}導入坐標
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
創建RestTemplate對象
@Configuration//加上這個注解作用，可以被Spring掃描
public class RestTemplateConfig {
/**
* 創建RestTemplate對象，將RestTemplate對象的生命周期的管理交給Spring
* @return
*/
@Bean
public RestTemplate restTemplate(){
RestTemplate restTemplate = new RestTemplate();
//主要解決中文亂碼
restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));
return restTemplate;
}
}RestTempController
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
@RestController
@RequestMapping("/consumer")
public class ConsumerController {
// 從Spring的容器中獲取restTemplate
@Resource
private RestTemplate restTemplate;
/**
* 通過Get請求，保存數據
*/
@GetMapping("/{id}")
public ResponseEntity<String> findById(@PathVariable Integer id){
//發起遠程請求:通過RestTemplate發起get請求
ResponseEntity<String> entity = restTemplate.getForEntity("http://localhost:8090/goods2/1", String.class);
System.out.println("entity.getStatusCode():"+entity.getStatusCode());
System.out.println(entity.getBody());
return entity;
}
/**
* 通過Post請求，保存數據
*/
@PostMapping
public ResponseEntity<String> saveGoods(@RequestBody Goods goods){
//通過RestTemplate發起遠程請求
/**
* 第一個參數：遠程地址URI
* 第二個參數：數據
* 第三個參數：返回值類型
*/
ResponseEntity<String> entity = restTemplate.postForEntity("http://localhost:8090/goods2", goods, String.class);
System.out.println("entity.getStatusCode():"+entity.getStatusCode());
System.out.println(entity.getBody());
return entity;
}
@PutMapping
public ResponseEntity<String> updateGoods(@RequestBody Goods goods){
restTemplate.put("http://localhost:8090/goods2",goods);
return new ResponseEntity<>("修改成功", HttpStatus.OK);
}
@DeleteMapping("/{id}")
public ResponseEntity<String> deleteById(@PathVariable Integer id){
restTemplate.delete("http://localhost:8090/goods2/"+id);
return new ResponseEntity<>("刪除成功", HttpStatus.OK);
}
}只用maven不用springboot框架時只需要導入依賴到pom文件
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> </dependency>
直接new RestTemplate()對象使用即可
關于怎么在Spring中遠程調用HttpClient和RestTemplate就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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